Turning loss into an instrument of power.

Yes, he thinks. He can understand that very well.

Before he can let himself ruminate too long on just how well he understands it, Wei Wuxian opts to seize on the other part of Kevin's story. "Blood?" he asks. "Or, ah -- no, please don't tell me if it was something other than blood."

Because there are a lot of options, not all of which are fit for discussion with someone you just met.